Rule guided point marker



y 1947- P. B. KAHN- RULE G'UIDED PO-INT MARKER Filed May 31, 1946 ,1 4 w W n INVENTOR. PHIL. B. KAHM BY Patented July 8, 1947 UNITED STATES PATENT OFFICE RULE GUIDED POINT MARKER Phil B. Kahn, Guernewood Park, Calif.

Application May 31, 1946, SerialNo. 673,326

2 Claims.

The present invention relates to improvements in a point marker for spacing off, in conjunction with a graduated scale, equal spaces or points upon a. drawing, or similar delineation, wherein a bifurcated spring clip, arranged to slidably engage for longitudinal movement thereon, the grooves or other edges of a triangular draughting scale having transverse graduations, has a transverse leading edge arranged to coincide with transverse graduations on said scale,

said clip being also provided with an integrally formed spring arm arranged to normall and yieldingly retain a shielded and vertically disposed prick integrally formed thereon in proximate spaced relation to a drawing, or other sunporting surface of said scale, and in alignment with said leading edge, and to move said prick to prick said drawing or supporting surface and thereby mark or lay off, as in draughting, a plurality of equal spaces or points by moving the leading edge of the clip to coincide with successive graduations and repeatedly or successively actuating said spring arm to cause said prick to mark said drawing or supporting surface to divide the same or a line thereon into a plurality of equal spaces or points, accurately with a minimum expenditure of energy.

The primaryobject of the present invention then, is to provide a new and improved point marker having improved means for laying off a succession of equal spaces or points upon a drawing or the like.

Another object of the present invention is to provide a new and improved device of the character set forth having a greatly simplified and economically produced and operated construction.

A further object is to provide an improved marker of the type described having simple and effective means for normally protecting a perforating prick against damage, maladjustment, or misalignment as well as preventing accidental pricking of an operator or a draughtsman operating the device.

I accomplish these and other objects by means of the improved details of construction and arrangement of the several parts as disclosed in the drawings forming a part of the present application, and in which- Fig. 1 is a front elevation, on an enlarged scale, of my improved marker as applied to a triangular scale;

Fig. 2 is an end elevation of the left-hand end of Fig. 1;

Fig. 3 is an end elevation of the right-hand end of Fig. 1;

Fig. 4 is a broken plan view of Fig. 1; and

Fig. 5 is a broken detail view, on a still larger scale, of the prick and protective means therefor.

Referring to the drawings:

The numeral l is used. to designate one form of triangular scale having the usual longitudinal grooves 2 and transverse graduations 3 on the sides thereof.

The invention comprises 9, preferably metallic bifurcated spring clip 6 having opposite legs I and 8 each provided with a rounded portion 9 and I0, respectively, for slidably engaging the grooves 2 of the scale I for longitudinal movement thereon.

One leg, 8, for instance, is provided with an integrally formed horizontally disposed flange or lip l2 bent back upon itself through a ring !4 to form a spring arm l6 above said flange or lip l2 and having integrally formed upon the free end thereof a prick I! normally and yieldingly held and shielded within a recess l8 within what I term a transverse leading edge [9 of the clip or marker 6, and in alignment with said leading edge l9, as shown in Figs. 4 and 5 of the drawings, the purpose of which will hereinafter be more fully set forth.

In operation:

The scale I, with clip 6 attached as shown, is placed upon a drawing, delineation, or other supporting surface, not shown, with the bottom edge of the scale I aligned with or upon a detail or line to be divided, which position is indicatcd in plan view in Fig. 4 of the drawings.

The clip 6 is moved, preferably in the direction indicated by the arrows in Figs. 1 and 4 of the drawings, longitudinally along the scale I until the leading edge l9 thereof coincides with the proper graduation 3. By depressing the arm Iii against the spring tension thereof, the prick ll integrally formed upon the free end or surface of said spring arm I6 is moved from its proximate spaced relation within said recess l8 and caused to prick the drawing or other draft, not shown, in accurate alignment with a selected graduation 3 with which the leading edge [9 is coincident. When pressure upon the spring arm I6 is released, it normally recedes the prick l1 into the shielding recess [8 to prevent damage or maladjustment to said prick H, or accidental pricking of an operator.

The clip 6 is next moved until its leading edge I 9 coincides with the next graduation 3 upon the scale .Lwhich determines the dimension of the 3 spaces into which division is required. This is repeated until the required number of equal spaces have been laid off or marked upon the drawing or other delineation, forming a supporting surface for the scale I.

The advantage of this improved marker is that the leading edge [9 may be more accurately and easily moved into coincidence with a selected graduation and, in conjunction with an opposite graduation on the opposite edge of the scale I, as at 2!, more accurate results may be had than when a pencil point or similar marker is placed and spaced by hand alone.

The provision of this simple and economically produced and operated recess l8 within which the prick I1 is normally receded provides an effective means for preventing maladjustment and thereby preserving accuracy of the marking device.

While certain draughtsmen may prefer the position shown in'plan view in full lines in Fig. 4 of the drawings, which is a normal projection from Fig. 1 directly above said Fig. 4, it is obvious that the device easily may be reversed so that the arm l6 and prick l1 may be operated on the off side scale, as indicated in dotted lines in Fig. 4 of the drawings, instead of from the near side as hereinbefore set forth.

Having described my invention, I claim:

1. A marker comprising a bifurcated spring clip arranged to slidably engage a triangular scale having transverse graduations, said marker having a transverse leading edge with a recess therein and arranged to coincide with said graduations, and also having a vertically disposed prick within said recess and aligned with said leading edge, and spring means formed integrally with said clip and prick for normally and yieldingly holding said prick within said recess and in proximate spaced relation above a supporting surface of said scale and for moving said prick to prick said surface.

2. A marker comprising a bifurcated spring clip arranged to slidably engage rooves in two sides of a triangular grooved scale having transverse graduations, and having a transverse leading edge with a recess therein and arranged to coincide with said graduations, said clip also having a spring arm formed integrally therewith and having a vertically disposed prick formed integrally on said spring arm and normally and yieldingly held by said arm within said recess and in alignment with said leading edge and also in proximate spaced relation above a supporting surface of said scale and movable by said arm to prick said surface.

PHIL B. KAHN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,470,470 Pas Oct. 9, 1923 1,396,806 Beals Nov. 15, 1921 833.168 Keller Oct. 16, 1906 

